[ttml2] Pull Request: Update requirements appendix M

nigelmegitt has just submitted a new pull request for https://github.com/w3c/ttml2:

== Update requirements appendix M ==
Closes #835 by adding support for requirements previously unsupported or partially supported.

See https://github.com/w3c/ttml2/pull/836

Received on Monday, 18 June 2018 13:18:15 UTC